Novel Approaches to Removal of Uremic Toxins

Dear Colleagues,

End-stage renal disease is characterized by the accumulation of uremic toxins, chronic inflammation and increased oxidative stress, all of which may contribute to the high morbidity and mortality observed in hemodialysis (HD) patients.

Uremic toxins were initially classified into three broad categories: small water-soluble solutes, middle molecules and protein-bound uremic toxins (PBUTs). More recently, the improved identification of a wide spectrum of large middle molecules has highlighted their central role in the pathophysiology of uremic syndrome. Consequently, enhancing the removal of these middle molecules has become a major therapeutic objective in modern dialysis strategies. Although conventional HD efficiently removes small solutes, the inadequate clearance of large middle molecules remains a significant limitation. The development of innovative approaches, including online hemodiafiltration with high convection volumes and the use of medium cut-off or super high-flux membranes within the framework of expanded hemodialysis, has improved the removal of large middle molecules.

PBUTs are also strongly associated with cardiovascular complications, oxidative stress and inflammation. Although these toxins generally have a relatively low molecular weight, their strong binding affinity to plasma proteins markedly limits their clearance. Nevertheless, encouraging results have been reported with strategies combining HD with displacers or sorbent cartridges to enhance PBUT removal.

Dr. Mohamed Belmouaz
Guest Editor

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